St Nylon Insert Nut M12, A2 Stainless Steel, supplied in a pack of 200.
Nylon insert lock nuts have a nylon collar that grips the bolt thread and resists loosening under vibration. Used on machinery, trailers, gates and any joint that moves or vibrates in service.
Tighten with a spanner or socket, and use a new nut when reassembling as the insert loses grip once removed.
